Inspection [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

HINT:

The valve opening temperature is inscribed on the water inlet with thermostat sub-assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Immerse the water inlet with thermostat sub-assembly in water, and then gradually heat the water.
Check that the valve of the water inlet with thermostat sub-assembly opens at the specified temperature.
Standard Valve Opening Temperature

80 to 84°C (176 to 183°F)

If the result is not as specified, replace the water inlet with thermostat sub-assembly.

Check the valve lift.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Valve Lift

Standard Valve Lift

10 mm (0.394 in.) or more at 95°C (203°F)

If the result is not as specified, replace the water inlet with thermostat sub-assembly.

Check that the valve is fully closed when the water inlet with thermostat sub-assembly is at low temperatures (below 77°C (171°F)).
If it is not fully closed, replace the water inlet with thermostat sub-assembly.